Question about 2002 Chevrolet Silverado

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My 2002 silverado has had a rough idle problem since the day i purchased it new. In the last 6 months the check engine light comes on and having a scaner I check the diagnostics and it is always the maf. Of course I clear it and it does reset but comes bach in a couple weeks. How do I check the maf to be sure that it is bad and that there is not a restriction or another problem that causes this?

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  • Chevrolet Master
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Waiting 15 years to try and figure this out , does not make good sense to me . you could try taking it to a good mechanic and have MAF cleaned or replaced

Posted on Aug 10, 2017

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COULD BE A VACUUM LEAK TAKE PROPANE TORCH AND LEAVE OFF PUT AROUND ALL VACUUM POINT WHERE YOU SUSPECT COULD POSSIBLY LEAK ENGINE SPEEDS UP THAT'S IT WORTH A SHOT BEFORE SPENDING MORE CASH

Posted on Nov 27, 2008

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SOURCE: Chevy truck running rough 150,000 miles

Find out why the engine light is coming on, it is the info u probably need to fix the running rough problem. Most auto parts stores will read the codes stored in your trucks computer for free, write them down, and ask what they mean and how to correct the problem. If u need more info, return to this site w/ codes for further help.

Posted on Dec 30, 2008

  • 1 Answer

SOURCE: 2003 Silverado rough idle, idles good after "check engine" light

Check your o2 sensor voltage, those trucks are real bad for o2 sensors, and yes if one sensor is reading 0mv, the others will start to drop out, and the vehicle will run very, rough. You also may check fuel system pressure, should be almost 60p.s.i. If its alot lower, Id be looking into a fuel pump. If that vehicle is drive-by-wire (no throttle cable), the throttle bodies get very dirty and cause that concern also. Id start by having the vehicle scantested.

Posted on Feb 07, 2009

emissionwiz
  • 76649 Answers

SOURCE: IDLE PROBLEM

Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Posted on Apr 14, 2009

  • 599 Answers

SOURCE: Car stalls when idling at stop light

have the car checked when the check engine light is on,also a good scanner will be able to give you the history codes,get back to me with the codes and we'll go from there. you need someone with a professional scan tool

Posted on May 13, 2009

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